Takes a tour of the Earth three hundred and twenty million years ago, during the Paleozoic Era, and investigates the plants and animals found there.

"Geronimo Stilton's ancient ancestor Geronimo Stiltonoot is back in another prehistoric adventure! It's the annual cavemouse sports competition! This year, Tiger Khan and his saber-toothed henchmen want to enter the games. They call a truce with the cavemice during the tournament...but when their flag goes missing, Tiger Khan is furious. Can Geronimo Stiltonoot track it down in time to keep his fur intact?" --

Introduces some animals that lived long ago, such as the giant sloth, camelus, huge roaches, and uintatherium.

Describes what has been learned about the physical appearance, behavior, and surroundings of the long-extinct woolly mammoth.

"Learn all about the ancient animals known as mammoths and mastodons, from how they lived to how they are related to today's elephants."--

"Geronimo Stilton's ancient ancestor Geronimo Stiltonoot is back in another prehistoric adventure! It's the night of the big Cavemouse Idol competition, but Geronimo Stiltonoot isn't there. He has a cold, and goes to bed early. So when it's discovered that the contest's valuable grand prize has been stolen, Geronimo is the main suspect! He must prove his innocence ... or he'll end up in enormouse trouble!"--

This title covers 10 frilled dinosaurs from Archaeoceratops to Zuniceratops, discussing each dinosaur's anatomy, behavior, and adaptations.-- Describes the physical characteristics and behavior of frilled dinosaurs, including Einiosaurus, Protoceratops, and Triceratops.

This title covers 10 long-necked dinosaurs from Amargasaurus to Uberabatitan, discussing each dinosaur's anatomy, behavior, and adaptations.-- Describes the physical characteristics and behavior of long-necked dinosaurs, including Brachytrachelopan, Diplodocus, and Mamenchisaurus.

This title covers 10 giant meat eaters from Acrocanthosaurus to Tyrannosaurus rex, discussing each dinosaur's anatomy, behavior, and adaptations. Describes the physical characteristics and behavior of meat-eating dinosaurs, including Allosaurus, Majungasaurus, and Suchomimus.